Added RenderTarget and RenderTarget2D classes to the XFX::Graphics namespace
Added Internal StorageDeviceAsyncResult class to the XFX::Storage namespace to aid in the implementation of the Guide.
Added Guide::BeginShowMessageBox and Guide::EndShowMessageBox methods
Began fixing comments to properly show up in IntelliSense
Added Exceptions to the System.Xml library
Added missing DisplayModeCollection class
Added Stack class (will be tested soon, and removed again if it doesn't work)
* This revision's libXFX doesn't build. This is due to the List template not handling pointers to abstract classes the way I'd like it to do. Need to look into.
Now, the only thing keeping XFX from a full compile is my stupid attempt at Asynchronous IO. Will look at that, but most likely, I will comment it out and just get a new Demo out before New Year.
